diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 4444579c3..813c94e1c 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -3937,13 +3937,15 @@ testcase TC_assignment_codec_amr_h_start_mode_auto() runs on test_CT {
 }
 
 testcase TC_assignment_codec_amr_f_start_mode_4() runs on test_CT {
+	/* "amr tch-f modes 0 2 4 7" => total 4 modes and start mode 4 => '11'B on the wire */
 	f_TC_assignment_codec_amr(true, '2b9520882208'O, '11111111'B, '00000010'B,
 		start_mode := "4");
 	f_shutdown_helper();
 }
 
 testcase TC_assignment_codec_amr_h_start_mode_4() runs on test_CT {
-	f_TC_assignment_codec_amr(false, '2b15208820'O, '10010101'B, '00010101'B,
+	/* "amr tch-h modes 0 2 4" => total 3 modes and start mode 4 => '10'B on the wire */
+	f_TC_assignment_codec_amr(false, '2a15208820'O, '10010101'B, '00010101'B,
 		start_mode := "4");
 	f_shutdown_helper();
 }